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hair related research references ||
testosterone related research references
Biol Reprod. 2002 Jul;67(1):263-8.
Relationship of serum testosterone concentrations to mate preferences in rams.
Roselli CE, Stormshak F, Stellflug JN, Resko JA.
Department of Physiology and Pharmacology, Oregon Health & Science University, 3181 SW Sam Jackson Park Road, Portland, OR 97201, USA. rosellihsu.edu
This study examined systemic testosterone concentrations in rams that were classified according to their sexual behavior and partner preference as either female-oriented (FOR), male-oriented (MOR), or asexual (NOR). For this purpose, we measured testosterone concentrations under three separate conditions: in conscious rams during the nonbreeding season (June) and breeding season (November), and in anesthetized rams during the breeding season. Basal testosterone concentrations in conscious rams were not different among the three groups (P > 0.05) in either season. However, when rams were anesthetized, mean systemic concentrations of testosterone in FORs (mean +/- SEM, 13.9 +/- 7.4 ng/ml serum) were greater (P < 0.05) than in NORs (0.9 +/- 0.1 ng/ml), but not in MORs (2.2 +/- 6.2 ng/ml), whereas testosterone concentrations were not different between MORs and NORs (P > 0.05). Concentrations of testosterone in the spermatic vein of FORs (127 +/- 66 ng/ml) were greater (P < 0.05) than in MORs (41 +/- 10 ng/ml) and NORs (19 +/- 7 ng/ml). Serum LH concentrations were not different. Cortisol was higher (P < 0.05) in anesthetized MORs (25.1 +/- 4.2 ng/ml) and NORs (27.2 +/- 4.4 ng/ml) than in FORs (10.9 +/- 1.8 ng/ml). These results demonstrate that circulating testosterone concentrations are related to sexual behavior only when rams are bled under anesthesia. Thus, differences in basal androgen concentrations in adulthood cannot be responsible for expression of male-oriented preferences or low libido in sheep. Instead, functional differences must exist between the brains of rams that differ in sexual preference expression.
online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12080026&dopt=Abstract
Neuroendocrinol Lett. 2002 Jun;23(3):231-7.
Hypoxia alters testis development in neonatal rats.
Liu JX, Du JZ.
Division of Neurobiology and Physiology, College of Life Sciences, Zhejiang University, Yuquan Campus, Hangzhou 310027, People's Republic of China.
OBJECTIVE: To investigate the effects of continued hypoxia on postnatal development of the rat testis. DESIGN: Wistar rats were exposed to simulated hypoxia from birth to postnatal day (PND) 45. Testosterone (T) in the plasma and the testis was measured in rats at PND 3, 7, 14, 21, 28, 35 and 45 respectively. Testis histology and cellular ultrastructure were studied. RESULTS: a) Hypoxia induced a significant arrest of testes weight gain after PND 28; b) T release was significantly attenuated after PND 21; c) Alterations in histology and cellular ultrastructure were found in the testis, showing the swelling of testis interstitium and the enlargement of mitochondria in Leydig cells. CONCLUSION: Postnatal hypoxia stress alters testis development both in terms of function and structure, especially at the critical age of gonadal development.
online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12080284&dopt=Abstract
Hunan Yi Ke Da Xue Xue Bao. 1999;24(4):343-6.
[Roles of sex hormones and oxygen free radical in coronary heart disease]
[Article in Chinese]
Deng H, Zhou H, Sun M.
Department of Cardiovascular, Xiangya Hospital, Hunan Medical University, Changsha 410008.
To examine the roles of sex hormones and oxygen free radical(OFR) in coronary heart disease (CHD), the serum estradiol(E2), testosterone(T), SOD, MDA and lipid levels were measured in 44 postmenopausal women with CHD and 22 health women. Mean levels of T and MDA were significantly higher while mean levels of SOD and E2 were significantly lower in CHD group than those in control group. On relative analysis, there was a positive correlation between E2 and SOD, while a negative correlation was observed between T and MDA in CHD group. Eighteen postmenopausal women with CHD had been receiving nilestriol replacement therapy for 12 weeks. The serum SOD and HDL-C/TC levels increased significantly, but LDL-C and MDA decreased significantly. The overall data suggest that OFR plays an important role in CHD; Low E2 levels is a risk factor of CHD in postmenopausal women; Nilestriol replacement therapy can improve the metabolism of serum lipids and inhibit lipid peroxidation, therefore, it may be of benefit to postmenopausal women with CHD.
online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12080642&dopt=Abstract
Metab Brain Dis. 2002 Jun;17(2):55-63.
Testosterone treatment attenuates the effects of facial nerve transection on glial fibrillary acidic protein (GFAP) levels in the hamster facial motor nucleus.
Coers S, Tanzer L, Jones KJ.
Department of Cell Biology, Neurobiology, and Anatomy, Stritch School of Medicine, Loyola University of Chicago, Maywood, Illinois 60153, USA. scoerumc.edu
Testosterone propionate (TP) administration coincident with facial nerve injury accelerates the recovery rate from facial muscle paralysis in the hamster. One mechanism by which TP could augment peripheral nerve regeneration is through glial fibrillary acidic protein (GFAP) regulation in the facial motor nucleus. In a previous study, axotomy alone induces increases in GFAP mRNA. with TP significantly attenuating the axotomy-induced increases in GFAP mRNA. In the present study, immunoblotting techniques were used to extend our previous GFAP mRNA studies to the protein level. Castrated male hamsters were subjected to a right facial nerve transection, with half of the animals receiving subcutaneous implants of 100% crystalline TP. The left facial motor nucleus of each animal served as an internal control. Postoperative survival times include Days 4, 7, and 14. In non-TP-treated animals, facial nerve transections alone increased GFAP levels at all time points, relative to internal controls. As previously observed at the mRNA level, TP treatment attenuated but did not eliminate the axotomy-induced increase in GFAP levels at all time points tested. These results suggest that the regulatory actions of gonadal steroids on GFAP expression manifested in parallel at the mRNA/protein levels.
online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12083337&dopt=Abstract
Concerned about losing hair? Hair loss and baldness is indeed a visible problem, and
could be more than just the matter of change in appearance.
Saw palmetto berry is a widely known herbal supplement for hair loss problems.
However, there are a number of great anecdotal herbs that people used for thousands of years stop hair loss and
start hair growth.
Numerous anecdotal cases have demonstrated that this herbal formula based on Chinese herbs actually improves the age-related hair thinning and hair loss
for a significant fraction of people who take it diligently. It is unknown how Hair Million herbs actually stop hair loss, and promote hair growth,
No scientific research or placebo controlled clinical trials have been conducted. Nonetheless, a number of people agree that it works.
DHEA is a natural hormone, and it is produced in our body by the adrenal glands.
DHEA has been suggested to provide numerous potential benefits. DHEA (or dehydroepiandrosterone) is converted into androgens (male hormones)
or estrogens (female hormones) in the cells.
Our bodies produce decreasing amount of DHEA as we get older.
various health benefits: To deter aging,
improve sexual function/erectile dysfunction, treat cognitive decline, enhance athletic performance,
facilitate weight loss, improve strength, prevent osteoporosis, enhance immunomodulation for rheumatic conditions,
and treat depression.
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